Cash Back & Reward Sites
Cashback sites are a great way to get a small rebate for online purchases.
The most popular cashback sites in Australia are Cashrewards and Shopback
I recommended to sign up to both sites as some merchants will offer different rates and some merchants may only be available at one of the sites.
Retailers which you can earn cashback from include Expedia, Dan Murphys, Coles, Woolworths, Amazon, Groupon, Uber eats plus many more.
Once you sign up to Shopback and Cashrewards you can browse the full list of merchants available. To earn cashback you simply click on the link from the cashback site and a tracking cookie is placed, then completed your purchase as normally, then wait for your cashback, just note its a slow process and can take 3 months before you get cashback even longer for travel related purchases.